Merge pull request #8 from aboutbits/change-aware

add ChangeAware interface

src/main/java/it/aboutbits/springboot/toolbox/persistence/ChangeAware.java

@@ -0,0 +1,13 @@
+package it.aboutbits.springboot.toolbox.persistence;
+
+import java.time.OffsetDateTime;
+
+public interface ChangeAware {
+    OffsetDateTime getCreatedAt();
+
+    OffsetDateTime getUpdatedAt();
+
+    void setCreatedAt(OffsetDateTime createdAt);
+
+    void setUpdatedAt(OffsetDateTime updatedAt);
+}